Valve grinder



W. R. AKANS Jan. 3, ,1939.

VALVE GRINDER Filed July 8, 1958 INVENTOR A KJILS fifimn Patented Jan.3, 1939 UNITED STATES PATENT OFFICE 3 Claims.

My invention relates to valve grinders and has for an object theprovision of a device particularly adapted for use in regrinding wornvalve seats and which may be employed for use on valves embodying fiatvalve seats or tapered valve seats.

My invention further comprises a valve grinder embodying means fordetachably connecting suitable guide members to prevent displacement ofthe grinder when same is being rotated, the guide members being designedto conform' to the aligning means provided on the valves being workedupon.

My invention further contemplates the provision of a valve grinderhaving replaceable grinding discs, together with suitable fasteningmeans permitting worn discs to be readily removed and replaced by newdiscs.

My invention further contemplates the provision of a valve grinder thatcan be rotated by means of an ordinary screw driver to grind the valveseats and which can be operated by those not skilled in this art withperfect results.

My invention further contemplates the provision of a valve grinder whichmay be sold for ten or fifteen cents and in various sizes and designs.Due to the simplicity of design and inexpensiveness of construction, thevalve grinder may be purchased'by individual users for simple operationsand then discarded; whereas, it has heretofore been necessary to eitheremploy high-priced mechanics to regrind the valve seats or else toreplace the worn valves With new valves.

My invention embodies other novel features, details of construction andarrangement of parts which are hereinafter set forth in thespecification and claims and illustrated in the accompanying drawing,forming part thereof, wherein:

Fig. 1 is a top plan view showing one form of my improved valve grinder;

Fig. 2 is a sectional view taken along the line II-II of Fig. 1;

Fig. 3 is a detail side elevational view showing one form of guidemember for attachment to the grinder for use in grinding tapered valveseats on internal combustion engines;

Fig. 4 is a transverse sectional view showing a modified form of myinvention in which the valve grinder is provided with a fiat grindingface and a tapered grinding surface;

Fig. 5 is a transverse sectional view showin another modified form of myinvention adapted for use in grinding flat valve seats;

Fig. 6 is a side elevational view showing the grinder illustrated inFig. 5 in operating position and having the guide member shown in Fig. 7attached thereto; 7

Fig. '7 is a side elevational view showing a modified form of guidemember employed in grinding fiat valve seats; and V Fig. 8 is atransverse sectional view showing a modified form of clamping screw forthe grinding discs.

Referring now to the drawing for a better understanding of my inventionand more particu- 10 larly to the form illustrated in Figs. 1 to 3, Ishow a valve seat grinder comprising a body portion II which may beformed of any suitable material and formed in two halves l2 and I3. Thebody portion is provided with a central aperture hi to receive a bolt [6which is slotted at [1 and Hi to receive a screw driver l9 and isthreaded at 2| to receive a locking nut 22. This form of grinder isformed with two tapered working faces 23 and 24 adapted to receivecup-shaped abrasive discs 26 and 21 which are held in position by meansof Washers 28. The working faces 23 and 24 are tapered to correspondwith the angle of the tapered valve seat to be finished. The disk 26 isprovided with fine or small grain abrasive material to provide apolished finish on the valve seat; and the disk 27 is provided withcoarse grains of abrasive material to form a rough finish.

In Fig. 3 I show a dotted outline of a valve seat 3] of the kindemployed in internal combustion engines. In regrinding this type ofvalve it is necessary that the valve seat be in alignment with the axisof the valve stem of the tappet valve employed therewith, so I haveprovided a guide finger 32 which is threaded at 33 to engage the threads34 provided on the inside of the bolt I6.

In Fig. 4 I show a modified form of my invention in which one of thehalves 12 or I3 of the body portion H is employed to provide acombination tapered working face and fiat Working face 36. A fiatabrasive disk 31 is secured on the fiat working surface by means of awasher 38 and a bolt 39 which is shown to be shorter than the bolt IEbut is otherwise similar thereto in all respects.

In Figs. 5 and 6 I show another form of my invention comprising a bodyportion 4| having 50 two flat working surfaces 42 and 43 adapted toreceive fiat abrasive discs 44 and 45 which are held in position bymeans of washers 46 and a bolt 39. This type of grinder is adapted forregrinding fiat valve seats 41, and the discs 44 and 45 are of the roughfinish and fine finish types, respectively.

In Fig. '7 I show a modified form of guide mem ber 51 comprising a bodyportion 52 and a stem 53 which is threaded at 54 for engagement in thethreads 34 of the bolts 16 or 39.

In Fig. 8 I show a modified form of bolt 56 comprising a male portion 51and a female portion 58 which are threaded at 59 and BI, respectively,for engagement with each other. This type of bolt may be employed inplace of the bolts H5 or 39 and is threaded at 62 to receive either ofthe guide members 32 or 5|.

While I have shown my invention in several forms it is obvious to thoseskilled in the art that it is not so limited but is susceptible ofvarious changes and modifications without departing from the spiritthereof; and I desire, therefore, that only such changes and limitationsshall be placed thereupon as are imposed by the prior art.

'I claim:

1. In a grinding device, a body portion having a pair Of working facesdisposed for grinding valve seats, an abrasive disk provided on eachworking face, means defining a centrally disposed aperture in the bodyportion, a bolt positioned in said aperture to clamp the abrasive disksin position on their respective working faces, and means definingsockets in opposite ends of the bolt to receive a driving tool.

2. In a grinding device, a body portion having a pair of working facesdisposed for grinding valve seats, an abrasive disk provided on eachworking face, a washer disposed on the outer side of each abrasive disk,means defining a centrally disposed aperture in the body portion, a boltp0- sitioned in said aperture to engage said washers to clamp theabrasive disks in position on their respective working faces, and meansdefining sockets in opposite ends of the bolt to receive a driving tool.

3. In a grinding device, a body portion having a pair of working facesdisposed. for grinding valve seats, an abrasive disk provided on eachworking face, a washer disposed on the outer side of each abrasive disk,means defining a centrally disposed aperture in the body portion, a boltpositioned in said aperture to engage said washers to clamp the abrasivedisks in position on their respective working faces, means defining a.threaded aperture extending centrally through said bolt, a threadedguide member for engagement in said threaded aperture, and meansdefining sockets in opposite ends of the bolt to receive a driving tool.

WILLIAM R. AKANS.

